Spark-gap muffler.



1 M. B. JOHNSON. *SPARK GAP MUFFLER.

APPLICATION FILED OCT. 6, 1910.

' Patented June 27, 1911.

ATTORNEY MAIQJRICEHBIERNAYS' JOHNSON, or SAN ANTONIO, TEXAS.

SPARK-GAP MUFFLER.

To all whom it may concern:- I

Be it known that I, Mannron Bnnxars Jonnson, a citizen of the United States, and

a resident of SanAntonio, in the county of .Bexar and State of Texas, have made and invented certain new and useful 7 Improvementsin Spark-Gap Mufflers, of which the following is a specification.

, My invention relates to an improvement in.- devices for use in wireless telegraphy, wireless telephony, or other like instances where an electric spark is caused to jump at wide gap, and which I have termed a spark gap muffler, the object of the inventionbeing to provide a device which will to a large eX- tent mutlle the sound or noise caused by the spark'when jumping the' gap. As 18 well known, these nstruments, by reason of the great noise emanating therefrom, have been placed or located in a closet or other inclosed compartment in order to mutlle or deaden the sound, but as in. many instances, no. such closet or compartment can be had, it has been necessary to have the instrument exposed in the room occupied by the operator, to his great inconvenience and discomfort.

I have des1gned my present invention with a view of muftling or deadening the sound of the instrument so that the necessity of locatingit at a distance from the operator or in some "inclosed compartment is avoided,

and with these and other ends in view the invention consists in certain novel features of construction and combinations of parts aswill be hereinafter fully described and pointed out in the claims.

Inthe accompanying drawings, Figure 1 is a view in perspective of my improved spark gap lnulller, and Fig. 2 a longitudinal sectional view'thereof.

Referring to the drawings, 5 represents a base plate formed of any desired insulating material, as for instance, hard rubber, glass, etc., and to which are secured the posts or standards 6, 7, provided with the binding screws 8, for securing thereto the conductors 9, it being understood, of co rse, that the posts or standards 6, 7 are made of conductive materiaL-such as brass or copper; In the standards or posts 6, 7, are threaded the terminals 1010, adapted to be adjusted toward or away from each other in order to lengthen or shorten the gap between them;

Specification of Letters Patent. Application filed October 6, 1910. Serial No. 585,546.

Patented June 27, 1911.

mutller proper, comprising the end plates 11-11 constructed of hard rubber, or other insulating materia-l, and formed on their inner sides or faces with disks of different diameters. Onto these disks are fitted the glass tubes oi cylinclers 12, 13, 14, one'within 'the other, the two inner disks 12 and 13 being provided with openings or perforations 15, theouter disk'14 being also provided with the perforations 16, if so desired, the result being that the noise due to the passage of the electric spark through the air in jumping the gap between the terminals 10-10 is to a great extent inu'tlled or deadened, so much so that it ceases to be a source of annoyance to the operator or others when in close proximity to the instrument. 1

In order to aivoid the turning of the inutller during the rotation or adjustment of the terminals 10-10, pins or studs 1'7 may extend from the posts 6, 7, into holes or'recesses formed in the plates 11-11, thereby securely locking the mulller against movement.

From the foregoing it will bennderstooth that my device is exceedingly simple in construction, cheap to manufacture, and effective in use.

What I claim is j 1. A spark gap mutiler comprisine'a base; two standards supported by said page; two terminals arrangedin line with onennother and supported by said standards, said terminals being adjustable toward and from one another to thereby vary the dista iee between. their inner ends; two plates supported one by each of said terminals, and having each a plurality of concentric seats; a plurality of concentric glass cylinders supported said plates and the ends of which engage the seats aforesaid; and means engaging said plates for preventing, movement of said plates and the cylinders supported by them.

I 2. A spark gap mntller comprising a base; two standards supported by said base; two terminals arranged in line with one another and supported by said standards, said terminals being adjust-able toward and from one another to thereby vary the distance between their inner ends; two plates supported one by each of. said terminals. and having each a plurality of concentric seats, and each plate having also a recess; a plurality of concentric glass cylinders supported by said plates and the ends of which engage the seats aforesaid; each of said cylinders being provided with a perforation; and two studs carried one by each of said standards and which studs extend'into the recesses aforesaid in said plates.

Signed at New York borough of Manhattan in the county of New York and State "0f New York this 30th'day of SeptemberA. D.

. MAURICE BERNAYS JOHNSON. Witnesses.

A. V. "WALSH,

M5 WHITE. 

